Explore the world of affordable two-factor authentication in this 58-minute conference talk from BSidesLV 2015. Dive into the intricacies of using YubiKey for enhanced security in your projects. Learn about FIDO, OAuth, PIV standards, and various YubiKey modes including One-Time Password. Discover personalization tools, installation processes, cloud and local validation methods, and how to set up a validation server. Gain insights into security considerations, potential attack modes, and misuse scenarios. Perfect for hackers and security enthusiasts looking to implement cost-effective, robust authentication solutions.